To unite, or form a relation, as between families by marriage, or between princes and states by treaty, league or confederacy.

To form a relation by similitude, resemblance or friendship. Note. This word is more generally used in the passive form, as families are allied by blood; or reciprocally, as princes ally themselves to powerful states.

A prince or state united by treaty or league; a confederate. The allies of Rome were slaves. IAD ALL Y.

One related by marriage or other tie; but seldom applied to individuals, except to princes in their public capacity.